[jira] [Closed] (JAMES-2144) As an attacker I can overwrite JMAP attachment ContentType

["Antoine Duprat (JIRA)" <se...@james.apache.org>]

     [ https://issues.apache.org/jira/browse/JAMES-2144?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Antoine Duprat closed JAMES-2144.
---------------------------------

> As an attacker I can overwrite JMAP attachment ContentType
> ----------------------------------------------------------
>
>                 Key: JAMES-2144
>                 URL: https://issues.apache.org/jira/browse/JAMES-2144
>             Project: James Server
>          Issue Type: Bug
>          Components: JMAP
>            Reporter: Antoine Duprat
>            Assignee: Antoine Duprat
>
> Action: As an attacker I can overwrite JMAP attachment ContentType in anyone mailbox.
> Access required: 
> None (sending a mail)
> Exact content of the attachment whose ContentType to be replaced
> Cause of the vulnerability: The content-type is not taken into account in the AttachmentId computation. Only content is. Hence sending the same message two time with different content type will result in a single attachment being stored, hence a content-type overwrite.
> Exemple of exploit:
> usera sends a PDF to various persons.
> I receive it.
> I send the same PDF to myself, but with Content-Type text/plain.
> The Content-Type of the attachment is now changed for each persons.
> Fixing it:
> We will change the AttachmentId computation algorithm to take into account content-type. Different content type will mean different attachmentId and thus no content-type overwrite.



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